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Rafael has a business selling computers. He buys computers from the manufacturer for $450 each and sells them for $800. Each month, he must also pay fixed costs of $3000 for rent and utilities for his store. If he sells n computers in a month, which of the following equations can be used to find his profit?

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Rafael has a business selling computers. He buys computers from the manufacturer for $450 each and sells them for $800. Each month, he must also pay fixed costs of $3000 for rent and utilities for his store. If he sells <i>n</i> computers in a month, which of the following equations can be used to find his profit?






 
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